_________ it takes many years to gain the skills of an expert.
| A．It is well known to us that | B．As is known to us that |
| C．As we know that | D．That is well known to us |
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_________ it takes many years to gain the skills of an expert.
| A．It is well known to us that | B．As is known to us that |
| C．As we know that | D．That is well known to us |
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